Search results

  1. D

    '82 50hp merc-no spark on 2 cylinders

    It's my buddy's boat and I don't have any history on when it started. It's a 4 cylinder with distributorless CD ignition. The lower 2 cylinders have no spark. I tested the resistance by the book on the stator and trigger, both are in spec. I also tested the primary and secondary resistance...
  2. D

    '84 Black Max 200 water exit question.

    I have a severe over pressure situation on one motor, it was like that when I bought the boat and the PO had no idea about it. He just said it takes longer than the other motor to warm up. I'm pretty sure the problem is a wrong gasket or something at the base of the powerhead, but would like...
  3. D

    Black Max 200--High water pressure-?

    I have twins, sotra. The serial numbers say they're '84, but one power head is a newer style, not sure of the year. The newer one has a different poppet with an extra hose. The water pressure at idle is about 7 and the pee hole doesn't spew 'till it warms up. The older power head makes about...
  4. D

    Need help to ID 1977 29' Scarab center console.

    I bought this boat recently and have been trying to find the model name. It's a center console with a cuddy cabin. The modern ones like it are called sport and I found some earlier ones called a 300, but can't find any this old and the newer ones are a little different. I assume the 300 is a...
  5. D

    Twin black max wired to one battery-safe?

    I have twin 200s, serial #s say they're '84, but one power head is newer, unknown year. For sake of space I'd like to wire them to run off one start battery which will be wired through a switch to charge the house batt. Can this damage the charging systems; having them wired together? If so...
  6. D

    '84 200HP. Oil alarm self test ok, but no activation.

    I have twin Black Max 200 and both are doing the same thing. I get the long-short-short self test beeps at key on, but won't sound when the oil is low or when I disconnect the motion sensor. I checked to make sure the oil level sensors are closing the circuit and they are. I intentionally ran...
  7. D

    Finally unstuck lower unit!

    After over a week of fighting with the front stud on my 200 Black Max, it's out. I started out using penetrating oil, heat, prying, hammering, and yelling at it; didn't budge. The last couple days I decided the corrosion needed to be removed, not lubricated. I mixed up some oxalic acid and a...
  8. D

    Merc vs Quicksilver gear lube.

    I have a couple bottles of "Quicksilver High Performance" and a couple "Mercury High Performance Gear Lube +" The part numbers are the same except a Q on the Quicksilver and a K on the Merc. I heard once that they are the exact same fluid and perfectly mixable, can I get some confirmation...
  9. D

    Carb/timing synch--DO IT!

    I recently bought a boat that the motors (200 Black Max) had supposedly been completely tuned at a shop. They ran pretty well, but I decided to do the synch on them just in case. OMG, things were way off!!! I initially accepted a little hard starting and rough cold running as they're old...
  10. D

    Black Max 200-lower unit stuck on, need help please.

    I need to replace the water pump and the LU is stuck. The back half will flex down a bit, but it appears that the front stud is stuck to the housing. The stud itself is rusty and the housing is pitted a bit around it. I just got the boat and know it's been AT LEAST 6 years since the LU was...
  11. D

    Please help ID powerhead-Black Max 200

    I was told these are '87 motors. The tags on the transom mounts read 6514039 and 6514039. Now the tricky part, the powerheads are different so one's (or both) been changed. One has one piece cylinder heads, kinda softly rounded; the other has removable water jacket plates on the heads and...
  12. D

    Twin '87 Black Max 200 & single battery??

    First off, thank you guys for the help and making my boat tinkering day quite productive!! I'd like to know if it's safe for these charging systems to run two motors on a single battery. If not, is there a way to run an isolator and 'fool' the system into overcoming the voltage loss of the...
  13. D

    '87 Black Max 200-oil/temp alarm help needed.

    I have a twin engine boat I recently bought and am fixing up. One engine's alarm doesn't do the self test beeps at key on. Using a jumper I shorted the tan wire at the engine and the alarm does sound so the alarm and wiring are ok. I then disconnected the low oil wire and ran the motor, no...
  14. D

    Does my black max 200 need an electric fuel pump?

    I just bought a 29' 1977 Scarab center console with twin 200's, I think they are 1987 motors. I got the boat not running with no useful mechanical or operation history. The boat is a deep V and the motors are mounted pretty high, a few inches above 'normal'. The boat has an electric fuel pump...
Top